Even though I can see a Che Guevara sign in the crowd that doesn't automatically reveal this movement as far-left exclusively......Infact much like Italy's 5 Star Movement there are many souls in the yellow vests....far-left, far-right (one of their big shots wants an Army General in power) and also moderate....All united in the protest against the French PTB

I understand they're still thinking about creating a political party as EU elections are getting nearer ( May 2019)